Earl barney



UNITED STATES PATENT OFFICE.

EARL BARNEY, OF SOHENEOTADY, NElV YORK.

THERMOSTAT.

SPECIFICATION forming part of Letters Patent No. 516,043, dated March 6, 1894.

Application filed September 20, 1898. Serial No. $5,948. (No model.)

T0 at whom it may concern/.-

Be it known thatLEARL BARNEY, of Schenectady, in the county of Schenectady and State of New York, have invented a new and Improved Thermostat, of which the following is a full, clear, and exact description.

lily invention relates to improvements in thermostats, and the object of my invention is to produce an extremely simple apparatus which is especially adapted for use in small places where it is hard to reach and adjust the thermostat, and also to construct the thermostat so that it is very sensitive to changes of temperature, and may be very easily adjusted so as to operate to close an electric circuit at any desired variation of temperature.

My improved thermostat on account of its adj ustability and the ease with which it may be adjusted, is especially adapted for use in incubators and similar apparatus, and is intended when the main blade is moved and the temperature changes, to close a circuit through an electric motor, and the latter will do the work required of it in the usual way, the motor connection forming no part of my invention.

To these ends myinvention consists of certain features of construction and combinations of parts, as will be hereinafter described and pointed out in the claims.

Reference is to be had to the accompanying drawings forming a part of this specification, in which similar figures and letters of reference indicate corresponding parts in all the views.

Figure 1 is a side elevation of the thermostat with parts in section. Fig. 2 is a plan view of the same; and Fig. 3 is a diagrammatic view showing the manner in which it may be connected with a motor and battery.

The thermostat is provided with a suitable base which is preferably of conducting material and on this is secured a box or bearing 11 in which the post 12 is mounted, this post having a reduced lower end 18 which rests in the box and which is fastened therein by a set screw it. By means of this set screw the blade 15 may be adjusted and held in position. The box 11 is adapted to turn in the base 10 and this enables the post 12 and. box 11 to oscillate or swivel slightly when battery and motor, as shown in Fig. 0.

the blade of the thermostat is moved. The thermostat is provided with a blade 15 which extends horizontally above the base 10 and which, at one end, is secured to the post 12. The thermostat blade is made up of two parts 15 and 16 of different expansibility, such as iron and brass, for instance, and these parts are riveted firmly together so that when the metals expand, the blade will be turned in one direction, and when they contract the blade will be turned in another direction, this movement being occasioned by the fact that one part expands more rapidly than the other, and consequently, during the expansion, the part which expandsless rapidly will have a restraining effect on the other, and cause it to swing to one side. The part 15 projects at its free end beyond the part 16, and it carries contact pieces 17 which are adapted to touch the contact screws 18 or 18, these screws being supported horizontally in posts 19 and 19, and the latter are secured in insulating material 20 on the base 10. It will be seen that by adjusting the screws 18 and 18", the blade 15 may be made to strike them when moved, to any desired extent. The posts 19 and 19 are connected by wires to and a respectively, with binding posts 21 and 21 which are insulated on the base 10, and a third binding post 22 is secured to the base and a connection is formed between this binding post and the blade 15 through the base, the box 11 and the post 12.

The thermostat may be connected with a Here the binding posts 21 and 21 connect with one pole of a battery 13 by means of wires 1) and I) while the third binding post 22 connects with the motor 23 and the other pole of the battery by wire 0.

It will be seen, that when the blade 15 is swung in one direction, it contacts by means of its buttons 17 with the screw 18 and a circuit is closed, which is as follows: from the battery 13 through the wire l), the binding post 21, the wire a, the post 19, the contact screw 18, the blade 15, the post 12, the box 11, the base 10, the post 22 and the wire a, through the motor and back to the battery. If, however, the blade 15 swings in the opposite direction it strikes the contact screw 18 and the circuit is then closed through the wire I), the post 21*, the wire a, the post 19, the screw 18, the blade 15, the post 12, the box 11, the base 10, the post 22 and the Wire 0, back through the motor to the battery. It will thus be seen that the circuit will be closed through the motor when the blade turns in either direction, and it will be understood that the motor may be arranged so as to turn in one direction when one circuit is closed, and the other when the second circuit is closed, and the motor may be made to operate any mechanism such as a damper, in the usual way. I

It will be seen that the instrument may be very nicely adjusted by means of the contact screws 18 and 18 and as the blade 15 is mounted in a revoluble support, the instru ment is very sensitive.

Having thus described my invention, what I claim as new, and desire to secure by Letters Patent, is-- 1. A thermostat, comprising a conducting base, a box journaled thereon, a post mounted in the box, a blade secured to the post and extending laterally from it, the blade being formed of materials of difiering expansibility,

together, the longer material being provided with contact pieces, insulated posts on the base, contact screws carried by the posts, insulated binding screws on the base and connected with the contact posts, and a third binding post on the base and electrically connected with the blade, substantially as de scribed. V

EARL BARNEY.

Witnesses:

J. T. SOHOOLORAFT, CHARLES HASTINGS. 

